Research & reports

· Agronomy · United Kingdom

Assesses waste almond shells and a recycled plastic drainage plank as sustainable hydroponic media alternatives to perlite, evaluating physicochemical properties and lettuce germination and greenhouse growth.

Remigio Paradelo, Cecilia Herbón, María Teresa Barral · Journal of Environmental Quality · Spain (Santiago de Compostela)

This study analyzed 56 urban soil samples (0–20 cm) from Santiago de Compostela, Spain, across various parent materials and land uses, to characterize their physicochemical properties. The soils were found to be coarse textured (sandy loam), acidic (pH 4.7–6.9), with moderate to high organic matter (13–137 g organic C kg−1). Unlike many urban soils, they did not exhibit alkalinity, high bulk density, or large amounts of artifacts, showing similarity to natural regional soils.

Phoebe Lickwar, Roxi Thoren · · United Kingdom

Welwyn Garden City was conceived by Ebenezer Howard as a utopian hybrid community combining the best aspects of city and rural life. Agriculture was integrated into the urban fabric in two forms: a buffering greenbelt surrounding the city and allotment gardens providing opportunities for domestic self-sufficiency. The garden city was designed as a closed-loop development connecting farms to local markets and reinvesting urban waste into soil regeneration.

Martí Rufí-Salís, Felipe Parada, Verónica Arcas‐Pilz, Anna Petit‐Boix, Gara Villalba, Xavier Gabarrell · Frontiers in Plant Science · Spain (Barcelona)

This study investigated a closed-loop crop cascade system in a Barcelona rooftop greenhouse, using tomato leachates to irrigate five successive lettuce cycles. The results showed that low yields (below 130 g per lettuce plant) were obtained when the cascade system was used during the early stage of the donor crop, as the nutrient amount, especially nitrogen, was insufficient for the receiving lettuce crop. Additionally, electrical conductivity values became too high (near 3 dS/m) at the end of the donor crop cycle, indicating limitations in maintaining optimal conditions throughout.

Ornela María Muñoz Millet, Antonio Yepes Jiménez · · Spain

A school in Spain implemented composting of organic waste from its canteen for use in an ecological school garden, with support from the AGROA school composting program and the Aguilas City Council. The entire educational community participates, from canteen staff separating waste, to the janitor transporting it, and teachers and students organizing it for compost and using it as fertilizer. This practice serves as a didactic resource for developing environmental attitudes and sustainable habits.

Silvio Cristiano, Marco Auriemma, P Cacciari, Manola Cervesato, Domenico Maffeo, Paola Malgaretto, Francesco Nordio · · Italy

This case study describes an ongoing community-supported agriculture (CSA) project in the urban-rural sprawl between Venice and Treviso, Italy. Farmers and consumers co-design and co-manage food provisioning and crop planning, sharing risks, avoiding food waste, and addressing financial barriers. The project aims to meet community food requirements while addressing economic, environmental, and social aspects, presenting feasible paths for sustainable transition.

Ryad Bouzouidja, Béatrice Bechet, Jitka Hanzlíková, Michal Sněhota, Cécile Le Guern, Hervé Capiaux, Liliane Jean‐Soro, Rémy Claverie, Sophie Joimel, Christophe Schwartz, René Guénon, Flóra Szkordilisz, Barnabas Körmöndi, Marjorie Musy, Patrice Cannavo, Thierry Lebeau · Journal of Soils and Sediments · Europe

A simplified methodology for assessing soil quality in nature-based solutions (NBS) was tested in Nantes, Nancy, and Bustehrad, focusing on former market gardening areas (FMG), green roofs (GR), and urban allotment gardens (UAG). While FMG and UAGs showed soil fertility equivalent to cultivated soils, FMG soil quality was significantly impacted by pesticide residues and trace metals from former agricultural practices. Data indicated that 12 of 14 FMG plots were classified as altered or very altered soils regarding molecular biomass.

Nicholas Henderson, Quentin Lefèvre · Sens-Dessous · France

This article investigates biology, economics and landscape through the lens of a relational paradigm that the author identifies as pervasive across both the social and life sciences, positing the relational nature of the world as an actant reality that remains largely invisible. It also examines the human relationship to the living world amid what it frames as a crisis in that relationship, and analyzes a shared permaculture garden as a manifestation of "relational design" — an approach to design centered on relationship.

Anna Pigott · Environment and Planning E Nature and Space · United Kingdom

Drawing on extended fieldwork with a Community Supported Agriculture project in south Wales, this article re-imagines soils as lively, complex, more-than-human ecologies by examining the largely sidestepped subject of spirituality in agriculture. It explores how care is cultivated through biodynamic farming, a non-conventional method incorporating astrological and spiritual principles, arguing that biodynamic narratives and rituals encourage attentiveness to more-than-human agency and energy, to depth both underground and in above-ground influences of air and celestial bodies, and to reciprocity between soil biota and humans — while also resisting drives to measure and map and leaving room for mystery. It also notes that despite biodynamic farming's growing popularity, its spiritual elements tend to be kept quiet, overshadowed by more familiar secular narratives.

Madeleyne Ivonne Demera-Pico, Carlos Francisco Ortega-Ordóñez · Dialnet (Universidad de la Rioja) · Spain

A study reporting the incorporation of substrate into an ecological garden while applying strategies for organic production. Solid waste was sorted and organic waste used to develop three types of compost: the first from humus-rich soil with 10% sandy soil, the second from silty soil with 20% sandy soil, and the third from silty soil with 40% sandy soil, aimed at improving water filtration and moisture retention. Each compost was combined with production strategies using biostimulants and ecological micro- and macronutrients, and irrigation water was monitored for chlorine concentration and pH before use. The compost made from silty soil with 40% sandy soil, combined with 5 mL of a biostimulant that adjusted alkaline water to neutral pH, produced the greatest increase in soil fertility and the best improvement in germination, cultivation, and post-harvest development.

Patrizia Papetti, Sara Spognardi, Enrica Iannucci, Ilenia Bravo, Claudio Beni · International Journal of Environmental Policy and Decision Making · Italy (Tor Mancina)

The demonstration garden of Tor Mancina, Italy, engages schools and local communities to test sustainable agricultural practices. It conducts experiments on the phytostimulant and pest repellent effects of plant extracts for crop protection. These activities aim to instill positive values regarding food, agriculture, and the environment in youth, while also seeking to improve crop performance and safeguard biodiversity.

Francesca Cappellaro, Laura Cutaia, Carolina Innella, Claudia Meloni, R. Pentassuglia, Vincenzo Porretto · Environmental Engineering and Management Journal · Italy (Rome)

This paper presented several circular economy practices integrating circular strategies at an urban scale, focusing on the Centocelle district in Rome, Italy. Through the employment of smart solutions and a collaborative process involving citizens, circular economy urban practices such as community gardens, co-workings, local and km0 production systems, and recycling centers were identified. These practices achieved urban transformation in terms of regeneration, sharing economy experiences, resource optimization, and closed-loop systems, positively and actively influencing the urban community in supporting the transition towards circular economy models.

Joan Morales Moras · Kepes · Spain (Barcelona)

This study examined an academic project in Barcelona, Spain, where design students collaborated with the self-managed Espai Quiró urban agriculture and organic community project in the La Salut neighborhood. The involvement of the community managers and students in this pedagogical experience responded to a design model committed to citizens and citizen-led neighborhood associations. This participated in the idea of transition towards a new alternative way of living in cities, advocating for the reappropriation of public space.

Arne Backlund, Annette Holtze · Linnaeus Eco-Tech · Europe

A report on one of several wastewater projects run since 1998 by Storstrøm County and A & B Backlund ApS in Denmark, examining source-separating (diverting) toilet technology and the composition of collected human urine mixture and composted faeces, carried out under an Action Plan administered by the Danish Environmental Protection Agency. User experience in the Danish projects shows the diverting technology is accepted in housing areas, works well in public places, and is highly appreciated in allotment gardens, though further technical improvement is still needed. Comparing the collected urine mixture's nutrient, heavy-metal, organic-compound and microorganism content against organic fertilizers used in Danish agriculture, the analyzed urine mixture was found to be of high quality.

Casals J., Rivera A., Figàs M. R., Casañas C., Camí B., Soler S., Simó J. · Frontiers in Plant Science 9:1491 · Mediterranean

Compares lettuce landraces and modern varieties under Mediterranean winter organic farming, evaluating their agronomic and use value from the combined viewpoints of breeders, consumers and farmers.

Arredondo-Garrido D. · VLC arquitectura. Research Journal, 5(2), 29-58 · Germany

Contextualizes Migge's collaborations with architects such as Taut, Wagner and May, arguing for his key role in the success of 'productive Siedlungen' in which agriculture was fully integrated into modern housing estates.

Burghardt W., Schneider T. · Journal of Soils and Sediments · Germany (Ruhr)

Analysed pH, bulk density, and contents/stocks of organic carbon, nitrogen and heavy metals (Pb, Cd, Zn, Cu, Ni) in vegetable patches, lawns and compost heaps across fourteen gardens in four allotments of the northwestern Ruhr area.

Burghardt W., Heintz D., Hocke N. · Eurasian Soil Science · Germany (Ruhr)

Compared vegetable-garden soils with surrounding arable land in the central Ruhr area, analysing horizons, texture, pH, bulk density, C/N ratio, and stocks of organic carbon, nitrogen and available nutrients.

Lidia Oktaba, Diana Odrobińska, Łukasz Uzarowicz · Journal of Soils and Sediments · Poland

This study assessed the impact of different land use types on soil organic matter (SOM) properties across 35 sites, including lawns, allotment gardens, fallows, and arable lands, in Pruszków Town, Poland. Humus horizons (0–20 cm) were analyzed for soluble SOM (PY), humins (HM), low molecular weight humus, and humic acids (HA) using extraction and UV-Vis spectroscopy. Results showed that humins were the dominant humus component, with central town soils containing twice as much HM and PY as peripheral zones.

Villarino Hernandez, Diana Carolina · · United Kingdom (Glasgow)

This thesis proposes a redevelopment project for the Govan Graving Docks in Glasgow, Scotland. The project aims to make the port complex, abandoned since 1988, safer, more sustainable, and integrated with the existing urban environment by incorporating vertical farming and sustainable organic agriculture technologies. Vertical farming is positioned as a key element for developing new markets, shops, galleries, and a residential building.

Cécile Le Guern, Liliane Jean‐Soro, Béatrice Bechet, Thierry Lebeau, Dorine Bouquet · Land Degradation and Development · France

Urban allotment gardens in Nantes, France, were found to have soil contamination, with lead (Pb) levels ranging from 100–400 mg kg−1, posing health risks. Local actors collaborated to characterize soil, evaluate sanitary risks, and discuss management options. The most frequent solution was replacing polluted soils with clean soils, while other strategies included on-site management of excavated soil, non-accumulative cropping, or changing land use.

Alexander Wezel, Julia Goette, Elisabeth Lagneaux, Gloria Passuello, Erica Reisman, Christophe Rodier, Grégoire Turpin · Sustainability · Europe

A study mapping the development of agroecology in Europe through a literature review, interviews, conference participation and internet search. It finds that agroecological research and higher education are concentrated more in western and northern Europe, though farm schools and farmer-to-farmer training exist in other regions too. Bottom-up initiatives and national or continental networks and movements are increasing, with food sovereignty and access to land and seeds as major themes. Except for France, the study states there are very few concrete agroecology policies in Europe.

Przemysław Charzyński, Renata Bednarek, Patrycja Hudańska, Marcin Świtoniak · Soil Science & Plant Nutrition · Poland

This study examined the extent and properties of garden soils in Toruń, Poland, using five soil profiles from four allotment gardens; the city has 66 allotment gardens covering over 300 ha, or 3% of the city area. None of the studied mineral surface horizons met the criteria for a Hortic horizon under the World Reference Base (WRB) 2015 classification because of too-low phosphorus content, although the other hortic criteria were fulfilled, and the authors recommend further study at a larger scale to evaluate whether the WRB criteria are too strict for typical garden soils that are only a few decades old.

Kaduna‐Ève Demailly · Géographie et cultures · France

This article examines shared gardens in the Île-de-France region of France as territories of environmental transition. Based on a study of 48 shared gardens in the Parisian metropolitan area, the analysis of user and political actor discourses and practices highlights their role in improving living environments and raising awareness of environmentally friendly practices that promote urban biodiversity.

Marta Bożym · Ochrona Środowiska i Zasobów Naturalnych · Poland

A study measuring heavy-metal content (cadmium, lead, copper, zinc, nickel, chromium) in compost and resident earthworms sampled from home composters and allotment gardens in the Opole region of Poland. The compost samples themselves were not contaminated with heavy metals and stayed within Polish legal limits for solid organic fertilizers. However, metal accumulation in earthworms varied by metal: the bioaccumulation factor (BAF) was high for cadmium, lead and zinc, while no accumulation was found for nickel, chromium or copper. The authors conclude that earthworm species native to Poland, such as Eisenia fetida, can serve as potential bioindicators of metals in the environment.